Sink basin



FIG. 1 is a perspective view of a sink basin showing my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a left side elevational view thereof; and,

FIG. 7 is a right side elevational view thereof.

The broken lines showing of plumbing openings and the bottom side are for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for sink basin, as shown and described. 